FIG 1.

Mce domain-containing operon organization. (A) Depiction of the mycobacterial mce4 operon and other genes associated with Mce4 transporter function. The red C indicates the lipobox cysteine conserved within MceE proteins. Solid-color genes are shared between Mycobacterium tuberculosis and Mycobacterium smegmatis. Hatched-color genes are found only in Mycobacterium smegmatis. Genes located within boxes are outside the mce4 locus. (B) Depiction of the E. coli mla operon and other genes associated with Mla transporter function. Genes located within boxes are outside the mla operon.